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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc1bff65ceb650442cf481e6eb59b4735864efed1441112480a2ee333a7a2c95' 
  AND token = '7915zZdR5eUiPfBHptUFORH84vz0V5vH0Nn22IYtw4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}